Transcript

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>> They were found collapsed on a park bench. But British authorities now say ex-Russian spy, Sergei Skripal and daughter Yulia, were poisoned by a nerve agent left on the front door of their home. There investigators found the highest concentration, of the Novichok Toxin thought to have been used.

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Both were rushed to a hospital on the fourth of March, where medics feared the poisoning could lead to brain damage. But on Thursday, doctors at the Salisbury District Hospital, said Yulia's condition had markedly improved. She's now said to be stable, though her father remains in a critical condition.

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The attempted murder plunged diplomatic relations to a new post-cold war low. Britain blames Russia. Moscow denies any involvement, while together western nations have expelled around 130 Russian diplomats. Skripal ended up in Britain after a Cold War style spy swap between Russia and the West. Since finding refuge, he has lost both a wife and son, and has lived modestly in this house, bought under his own name in 2011.

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Police say this is where they will continue to focus their investigation.